Thermal and surface anisotropy effects on the magnetization reversal of a nanocluster
Thermal and surface anisotropy effects on the magnetization reversal of a nanocluster
复制标题
热和表面各向异性对纳米团簇磁化反转的影响
DOI：
10.1088/0022-3727/41/13/134004
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Y. Kalmykov
中科院分区：
文献类型：
--
作者：
P. Déjardin;H. Kachkachi;Y. Kalmykov
通过有效各向异性模型计算表面各向异性 (SA) 的影响，计算球形磁性纳米团簇的弛豫率和温度相关的转换场 (SF) 曲线。特别是，研究表明，SA 可以将热激活磁化反转改变一个数量级以上，并且与温度相关的 SF 曲线明显偏离 Stoner-Wohlfarth 小行星。考虑到最近和未来的 μ-SQUID 测量，我们指出了如何将我们的结果与孤立星团的实验数据进行比较，从而获得关于 SA 的有价值的信息。
The relaxation rate and temperature-dependent switching field (SF) curve of a spherical magnetic nanocluster are calculated by including the effect of surface anisotropy (SA) via an effective anisotropy model. In particular, it is shown that SA may change the thermally activated magnetization reversal by more than an order of magnitude, and that temperature-dependent SF curves noticeably deviate from the Stoner–Wohlfarth astroid. With recent and future μ-SQUID measurements in mind, we indicate how comparison of our results with experimental data on isolated clusters may allow one to obtain valuable information on SA.